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Fixed that the const_missing autoload assumes the requested constant …

…is set by require_association and calls const_get to retrieve it. If require_association did not set the constant then const_get will call const_missing, resulting in an infinite loop #380 [bitsweat]
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@270 5ecf4fe2-1ee6-0310-87b1-e25e094e27de